mac-control SKILL.md skillA
mac-control from calebnewtonusc/chewbacca is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add calebnewtonusc/chewbacca/mac-control@git:20260921.fdfd752Pins git:20260921.fdfd752 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- calebnewtonusc/chewbacca
- Path
skills/mac-control/SKILL.md- Versions recorded
- 3
- Latest version
- git:20260921.fdfd752, committed Sep 21, 2026
- First version recorded
- Sep 4, 2026
- Size
- 5,809 bytes
- Repository stars
- 9
- License
- MIT
Control the user's Mac - click buttons, read the screen, drive apps, automate anything in the UI. Use when the user asks to click, open, close, read what is on screen, fill something in, navigate an app, or automate a task on their machine. Routes the request to the cheapest control layer that can do it, which is almost never a screenshot.
Collected from public GitHub. Every version is saved exactly as it was and never changes. Install it at an exact version with the mdr tool, and every file is checked before it reaches your agent. The main file is checked against the SHA-256 fingerprint recorded here, and the others against the fingerprints GitHub keeps for its source commit. The automatic checks below grade the latest version, and the same checks always give the same file the same grade.
What the file says
# Controlling a Mac You are about to act on someone's real machine. Their real email, their real files. ## The rule **Climb the layers. Stop at the first one that works. Never start at the top.** | Layer | Reach for it when | Command | |-------|-------------------|---------| | 1 Data | The answer is in a database or file | `sqlite3`, `defaults read` | | 2 Scripting | The app has an AppleScript dictionary | `chewie run '...'` | | 3 **Accessibility** | **Any GUI element with a name. The default.** | `chewie see`, `chewie click` | | 4 Input | Pure keystrokes, no element | `chewie type`, `peekaboo hotkey` | | 5 Vision | Canvas apps, or genuinely visual questions | `chewie shot` | | 6 Browser | Anything in a browser tab | `chewie web` | The mistake you will actually make is jumping to layer 5 because it feels universal. A screenshot costs ~1,500 tokens and a second or more. An accessibility tree read costs ~50ms and a fraction of the tokens, and gives you element *names* instead of guessed pixels. **If `chewie see` shows the element, do not screenshot.** ## First, always ```bash chewie doctor ``` …
Read the whole file at its exact version.
How to install
mdr add calebnewtonusc/chewbacca/mac-control@sha256:2e3fd173792f8e16The line at the top of this page pins the label git:20260921.fdfd752, which is what most people want. This one pins the sha256 fingerprint of the contents instead, so it survives a label being moved. Either way the exact version is written to mdr.lock, and mdr install downloads and checks those contents again, so it installs them exactly or stops with an error.
[](https://markdownregistry.com/a/art_7tyuadicd7nfp2td)
3 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 3 versions of this file, between Sep 4, 2026 and Sep 21, 2026, about one every 9 days.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| git:20260921.fdfd752 latest | 2026-09-21 | fdfd752 | 5,809 B | A | view · diff |
| git:20260904.ee0eb1b | 2026-09-04 | ee0eb1b | 4,225 B | A | view · diff |
| git:20260904.25a1d94 | 2026-09-04 | 25a1d94 | 4,206 B | A | view |
Audit of the latest version
- pass: Frontmatter block present
- pass: Frontmatter declares a name
- pass: Frontmatter declares a description
- pass: Size between 200 bytes and 200 KB (5809 bytes)
- pass: No zero-width or bidi control characters
- pass: No instruction hidden inside an HTML comment
- pass: No link to an exfiltration or paste host
- pass: No credential-shaped string
- pass: No instruction to send local credentials anywhere
- pass: No text hidden with inline styles
- pass: No prompt-injection phrasing
- pass: No curl or wget piped into a shell
- pass: No recursive delete of root, home or parent
- pass: No instruction to read or print local credentials
- pass: No base64 blob over 200 characters
- pass: No link to a raw IP address
- pass: No script tag
Source
calebnewtonusc/chewbacca · 9 stars · license MIT · pushed 2026-10-03 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_7tyuadicd7nfp2td GET https://markdownregistry.com/api/v1/resolve?ref=calebnewtonusc/chewbacca/mac-control GET https://markdownregistry.com/api/v1/blob/2e3fd173792f8e16d2d7b873aba524d727b6cd7f4cfa23ce67971f66d6ab6f1a
Your AI assistant does the legwork. You hear about the deals worth your word. Hand yours the standing instructions at modelranch.com and it joins the network that reads files like this one.
Guides: the SKILL.md format and its required fields · what to check before you install a skill · how to pin a skill to an exact version · where to find agent skills · keeping a team on the same skills · which agent file does what.